Nsca
[医][=National Society for Clean Air]全国空气净化学会
🗣️ 情景例句
Oh, don't forget the mustard.
噢，不要忘了芥末。
It's a shame I haven't seen more of you these recent years.
真遗憾，最近几年我未能见到你。
The boy mustn't go to school yet,Mr.Williams.
这孩子还不能去上学，